中文摘要：

为了获得来流攻角对超声速膨胀器间隙流动特性及总体性能影响的规律,采用三维雷诺平均N-S方程和标准k-ε湍流模型,对不同来流攻角的超声速膨胀器的流场进行了数值研究。结果表明：压力面静压几乎不随攻角变化,而吸力面对来流攻角则较为敏感,特别是隔板前缘,随着攻角的增加,吸力面静压明显降低,最终导致隔板载荷的增加;攻角对尾迹的影响不大,小攻角增加了吸力面与下端壁相接角区的损失,而大攻角会导致泄漏损失的增加;随着攻角的增加,膨胀器的膨胀比上升,效率下降,膨胀比最多增加7.15%,而效率只降低0.72%,超声速膨胀器宜在正攻角范围工作。

英文摘要：

To obtain the laws of incidences effect on clearance flow behavior and overall performanceof a supersonic expander. The three dimensional Reynolds-averaged Navier-Stokes equations and the k-ε turbulent model were adopted to simulate numerically the flow field of a supersonic expander with different incidences. Results show that the static pressure of pressure surface almost doesn＇t vary with incidence, but suction surface is more sensitive, especially the leading edge of strake wall, static pressure of the suction surface obviously decreases when the incidence increases, and eventually lead to the load of the strake wall increases. Inci dences have a little influence on the wake, small incidence will raise the loss in the corner between suction surface and endwall, and high incidence will result in the increase of the leakage loss. With the increase of the incidences, the expansion ratio increa ses, and the adiabatic efficiency decreases, expansion ratio increases 7. 15 percent at most, and the efficiency decreases only 0. 72 percent, supersonic expander should be work in the range of positive incidences. Keywords： supersonic expander; incidence; isentropic adiabatic efficiency; expansion ratio